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-10x-21=15
We simplify the equation to the form, which is simple to understand
-10x-21=15
We move all terms containing x to the left and all other terms to the right.
-10x=+15+21
We simplify left and right side of the equation.
-10x=+36
We divide both sides of the equation by -10 to get x.
x=-3.6
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